APA (7th ed.) Citation

United States. Army. Ordnance Department. (1920). Circular, 1920. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Ordnance Department. Circular, 1920. [Washington]: GPO, 1920.

MLA (9th ed.) Citation

United States. Army. Ordnance Department. Circular, 1920. GPO, 1920.

Warning: These citations may not always be 100% accurate.